Hamstrings: Why You Train Both the Hinge and the Curl

The hamstrings are the most undertrained muscle on most lifters’ legs, and the reason is simple: people train them with one movement and assume that covers it. It does not. The hamstrings do two different jobs, and you have to train both. Here is why you need the hinge and the curl, and how to use them.

The Hamstrings Do Two Jobs

The hamstrings run up the back of your thigh and they have two functions. They extend your hip, which is the hinge, pushing your hips back and pulling them forward. And they bend your knee, which is the curl. Most leg programs train one of these and skip the other, which is exactly why so many lifters have flat, weak hamstrings even though they feel like they train legs hard.

The Hinge: Romanian Deadlifts

The Romanian deadlift is the king of hip-hinge hamstring work. You push your hips back, let the weight lower with your back flat and a soft knee, feel a deep stretch up the back of your legs, then drive your hips forward to stand. That deep stretch under load is where most of the growth happens, so lower under control and reach for the stretch instead of bouncing. Good mornings and stiff-leg deadlifts train the same pattern.

The Curl: Leg Curls

The leg curl trains the other job, bending the knee, and the hinge does not cover it. Lying, seated, and standing leg curls all work. Control the lowering, get a full stretch as the leg straightens, and squeeze at the top. The seated leg curl in particular puts the hamstring in a stretched position, which makes it a fantastic builder. Skipping curls leaves a big part of the hamstring untrained.

Why You Need Both

Because the two jobs load the hamstring differently, the hinge and the curl build different parts of it. Do only Romanian deadlifts and you miss the knee-bending function. Do only leg curls and you miss the hip-hinge function and most of the heavy loading. A complete hamstring needs both in the week, every week, not one or the other.

Put It Together

A complete hamstring plan is simple: one hinge for the hip function and the heavy stretch, one curl for the knee function. Lead with the hinge while you are fresh and strong, then finish with curls. Train both hard and the back of your legs fills in, your legs look complete from the side, and your knees get the balanced support they need.

The Gegns Gym Way

The Gegns Gym Leg Training Manual trains the hamstrings the way they actually work, with a hinge for the hip and a curl for the knee, both loaded through the stretch. Cover both jobs and the hamstrings finally grow.